127results about How to "Improve stress transfer" patented technology

By recessing drain and source regions, a highly stressed layer, such as a contact etch stop layer, may be formed in the recess in order to enhance the strain generation in the adjacent channel region of a field effect transistor. Moreover, a strained semiconductor material may be positioned in close proximity to the channel region by reducing or avoiding undue relaxation effects of metal silicides, thereby also providing enhanced efficiency for the strain generation. In some aspects, both effects may be combined to obtain an even more efficient strain-inducing mechanism.

The invention discloses an epoxy resin coating in a marine steel pipe 3PE anticorrosive coating and a preparation method thereof. The epoxy resin anticorrosive coating comprises the following components in percentage by weight: 55-65 percent of epoxy resin, 23.5-36 percent of filler and pigments and 10.4-15.3 percent of aids, wherein the epoxy resin comprises the following components in percentage by weight: 39-47 percent of E-12 epoxy resin and 16-23 percent of novolac epoxy resin. Talcum powder, mica powder, bentonite and titanium dioxide are properly added into the epoxy resin to serve as partial fillers. The use amount of the resin can be relatively reduced, the cost is reduced, the physical and mechanical properties can be improved; particularly, the elasticity modulus is increased, the cure shrinkage rate is reduced, the seawater impact resistance is increased, and the seawater resistance is improved.

The invention discloses a prefabricated reinforced concrete hollow pier socket and spigot joint connection structure and a manufacturing method. A component I of the structure is a prefabricated bearing platform; a corresponding pier column groove hole is reserved when the bearing platform is poured and is convenient for connection with a pier column, and meanwhile steel bar anchoring in the bearing platform and penetrating a hole is provided at the socket and spigot position, a component II is a prefabricated hollow pier column; the bottoms of the pier columns are welded through steel plates,holes are reserved in the corresponding positions of the steel plates, bearing platform anchoring steel bars can stretch into the holes conveniently, the overall connecting performance of the pier columns and the bearing platform can be obviously improved, meanwhile, inclined steel wedges are arranged at the corresponding positions of the pier columns and the bearing platform, after the pier columns are inserted, a self-locking function is achieved through rotation, temporary supports are not needed for reinforcement, and construction is facilitated. Meanwhile, interface ripples are arrangedon the surfaces of the pier column and the bearing platform, the connecting and shearing resistance performance is improved, a gap between the pier column and the bearing platform is subjected to crack pouring through UHPC, the socket and spigot joint quality is met to a great extent, and meanwhile the performance of high early strength and rapid construction is achieved. The operation is simple and convenient, the construction is easy and the quality is controllable.

The invention relates to the field of slope reinforcement and surrounding rock support control of underground engineering, disclosing an arrow anchor rod of multi-section clamping grouting anchoring,which comprises a sleeve (5), a grouting rod body device and a sealing device, wherein the grouting rod body device is arranged in the sleeve (5); the grouting rod body device comprises a grouting rodbody (7) and a plurality of groups of anchor heads (6); each group of anchor heads (6) forms a clamping anchoring structure and are connected to the outer wall of the grouting rod body (7) in hinge mode; the sleeve (5) is provided with a slotted hole (5002) which is in one-to-one correspondence with the anchor head (6) and suitable for the anchor head (6) to pass; the anchor head (6) is guided into the rock mass along the slotted hole (5002) by the external force of propelling grouting rod body device; a sealing structure is formed between the sleeve (5) and the grouting rod body device by utilizing a sealing device and is fixed on the rock wall (9). By adopting the technical innovation of the arrow anchor rod of multi-section clamping grouting anchoring, continuous high-resistance and high-strength working resistance can be provided timely and efficiently, so that the long-term stability of the engineering geotechnical mass maintenance under the environment of high stress or strong power disturbance can be truly achieved.

The invention provides a preparation method of a polyolefine/polyamide alloy material with a bicontinuous structure, which comprises the following steps: mixing fictionalized polybutadiene and polyolefine which is irradiated or added with peroxide initiator, wherein the weight ratio of the polybutadiene to the polyolefine is 3-20:80-97, and putting the mixture into an extruder for granulating by melt extrusion at 160-210 DEG C to obtain a first reaction product; and mixing the first reaction product and polyamide in weight ratio of 70-85:15-30, and putting the mixture into an extruder for granulating by blend extrusion at 230-300 DEG C to obtain the polyolefine/polyamide alloy material with the bicontinuous structure. By the method provided by the invention, the polyolefine/polyamide alloy material with the bicontinuous structure can be prepared under the condition of a small phase of polyamide, and the method has the advantages of simple process, low preparation cost and the like and is suitable for industrialized production.

The invention discloses an anchoring method applicable to a large-tonnage (larger than 50 tones) FRP inhaul cable. The FRP inhaul cable is anchored with a clamping piece type anchorage device, a protection transition layer with the length no smaller than the length of an anchoring area of the clamping piece type anchorage device is formed at the anchoring end of the FRP inhaul cable, the protection transition layer and the FRP inhaul cable are integrated, and the clamping piece type anchorage device is anchored to the protection transition layer. After the FRP inhaul cable and the protecting layer are pressed into a whole, while the shearing strength of the FRP inhaul cable and a protecting layer interface is increased, the phenomenon that the FRP inhaul cable weak in transverse strength makes direct contact with load transmitting mediums large in rigidity in the anchoring area can be avoided, a stressed buffering layer is formed, and the FRP inhaul cable can be indirectly protected. The anchoring method used for anchoring the FRP inhaul cable has the advantages of facilitating construction and being high in anchoring efficiency and the like, long-term performance of an anchoring system can be guaranteed, the method can also be used for tensile tests on the FRP inhaul cable, samples can be prepared easily and conveniently, and compared with an adhesive type anchoring method, test errors caused by overlarge shearing deformation of resin can be avoided.

The invention relates to a dopamine modified hexagonal boron nitride/para-aramid nanofiber composite material and a preparation method thereof. The method includes: step 1, mixing a dopamine modifiedhexagonal boron nitride dispersion solution and a para-aramid nanofiber dispersion solution, and then performing ultrasonic treatment to obtain a mixed system A, wherein the mass of the dopamine modified hexagonal boron nitride accounts for 10%-40% of the total mass of the para-aramid nanofiber; and step 2, conducting vacuum-assisted filtration and hot press drying on the mixed system A to obtainthe dopamine modified hexagonal boron nitride/para-aramid nanofiber composite material. The method ensures the formation of certain microstructure in the composite material, and then enhances the insulation properties of the composite material, and improves the interfacial binding capacity of the dopamine modified hexagonal boron nitride and para-aramid nanofiber, strengthens the stress transfer between the two materials while guaranteeing good heat conduction, strengthens the mechanical strength of the composite material, and acquires the composite material with excellent insulating performance and heat-conducting properties.

The invention aims to provide a glass fiber reinforced polystyrene micro-foam double-layer co-extrusion section. The core layer of the section contains 3-8% of a uniform-distribution glass fiber (by polystyrene) having a length-diameter ratio of 10-20. The surface of the core layer is coated with a layer of high-impact-resistance polystyrene, and the mass fraction ratio of the material of the core layer to the material of the surface layer is 100:5-25. The density of the section reaches 0.40g/cm<3>, so the tensile strength and the charpy impact strength of the section can reach 12MPa and 4.5kJ/m<2> respectively, and are 31% and 23% higher than that of a same micro-foam material not added with the glass fiber respectively. In the invention, a polystyrene raw material is substantially saved, and the production cost is reduced.

A strained semiconductor material may be positioned in close proximity to the channel region of a transistor, such as an SOI transistor, while reducing or avoiding undue relaxation effects of metal silicides and extension implantations, thereby providing enhanced efficiency for the strain generation.

The invention belongs to the field of petroleum and gas fracturing extraction and in particular relates to a graphene modified ultralow-density propping agent and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing graphene, an olefin monomer, a cross-linking agent (divinyl benzene) and an initiator under ultrasonic or stirring conditions so as to obtain a monomer mixture in which a Pi-Pi assembly effect is achieved between graphene and aromatic ring components; adding the monomer mixture into an aqueous solution of dispersing agents, performing the processes of balling, cross-linking and curing under the heating condition so as to obtain a microsphere precipitate; and filtering, washing and drying, thereby obtaining the graphene modified ultralow-density propping agent. According to the method disclosed by the invention, the organic polymer microsphere has low density, while the graphene has the performances of ultrahigh strength, high thermal conductivity and high temperature resistance, and then the composite material has ultralow density as well as the characteristics of high strength and high temperature resistance, so that the deep-well hydraulic fracturing requirement is met.

A joint construction for a column of steel pipes comprises a long steel pipe 1 of a first thickness t and a second steel pipe 2 of a second thickness T which is greater than that of the first. The steel pipes 1,2 are formed by either cold or hot forming to have the same outer shape and diameter, and they are welded together from the outside in an arrangement in which an end surface of the long pipe 1 is opposed to an end surface of the short pipe 2 which has no bevelled portion. An inner collar 3 can be included in the joint construction and may be positioned inside the long pipe 1 so that it can be abutted against the end surface of the short pipe 2. The pipes 1,2 may either be quadrangular or cylindrical.

The invention discloses a gel LED (light-emitting diode) heat-dissipation paint which is prepared from the following raw materials in parts by weight: 4-6 parts of fine silicon dioxide aerogel, 2-3 parts of trichloroiminocyanuric acid, 360-400 parts of high-density polyethylene, 100-130 parts of sodium hydroxide, 400-420 parts of bisphenol A, 160-180 parts of epoxy chloropropane, 10-12 parts of silicon nitride, 2-3 parts of acrylamide, 1-1.6 parts of ammonium chloride, 0.05-0.1 part of N,N-methylene-bis acrylamide, 3-4 parts of ammonium persulfate, 0.01-0.02 part of TritonX114, 1.8-2 parts of ammonia water, 10-20 parts of diethylenetriamine, 30-42 parts of nano carbon tube, 1-2 parts of N-hydroxymethyl acrylamide, 3-5 parts of aluminum dihydrogen phosphate, 1-2 parts of isopropyl myristate, 4-7 parts of dioctyl azelate and 7-10 parts of ceramic powder. The added fine silicon dioxide aerogel can improve the compatibility among the materials and enhance the surface strength and shock strength of the paint film.

The invention discloses a method for preparing a novel phenolic resin base composite material. The method comprises the following steps: (1) washing and drying a shell, cooling to obtain the dried shell, immersing the dried shell in a sodium hydroxide solution, taking out, washing, drying and grinding to obtain the shell powder; (2) adding the shell powder into a silane coupling agent solution, stirring and performing ultrasonic treatment to obtain the modified shell powder; (3) compounding a calcium sulfate crystal whisker into a suspension slurry, stirring and adding sodium stearate, continuously stirring, taking out, washing, filtering and drying the filter cake to obtain the modified calcium sulfate crystal whisker; (4) adding the phenolic resin, the modified shell powder and the modified calcium sulfate crystal whisker into a stirring kettle, stirring, drying to constant weight, and cooling to obtain a mixed material; and (5) putting the mixed material into a mould, putting the mould in a thermocompressor, performing decompression and degassing after prepressing, performing hot-pressing, baking and cooling to obtain the composite material. The composite material prepared by the invention is good in hardness and mechanical property.

The invention provides a bonding structure of a wind turbine foundation steel ring and concrete and a construction method and belongs to the technical field of wind turbine foundation construction. The bonding structure comprises the wind turbine foundation steel ring and concrete foundations. The lower end of the wind turbine foundation steel ring is arranged in the concrete foundations. The spaces between the inner wall of the wind turbine foundation steel ring and the concrete foundations, between the outer wall of the wind turbine foundation steel ring and the concrete foundations and between an end plate and the concrete foundations are filled with modified epoxy layers respectively. The construction method comprises the step of pouring of modified epoxy. According to the bonding structure of the wind turbine foundation steel ring and the concrete and the construction method, the spaces between the inner wall of the wind turbine foundation steel ring and the concrete foundations, between the outer wall of the wind turbine foundation steel ring and the concrete foundations and between the end plate and the concrete foundations are filled with the modified epoxy layers respectively, so that the wind turbine foundation steel ring and the concrete foundations are bonded into a whole through the modified epoxy, and good toughness and impact resistance are achieved. Therefore, the good effect of stress transfer of the wind turbine foundation steel ring is achieved, and safe operation of a wind turbine generator system is ensured.

The invention discloses a graphene modified polyolefin elastomer composite material and a preparation method thereof. The preparation method comprises the following steps: grafting and reducing graphene oxide by octadecylamine under an acid catalysis condition, so as to prepare octadecylamine functional graphene; blending and compounding the octadecylamine functional graphene and a polyolefin elastomer to prepare the graphene modified polyolefin elastomer composite material. The composite material is prepared from the following raw materials in parts by weight: 100 parts of a polyolefin elastomer and 0.1 to 20 parts of the octadecylamine functional graphene. The interfacial compatibility between a graphene sheet layer and a polymer matrix can be effectively improved in the presence of a grafting long alkyl chain and through removing an oxygen-containing group on the surface of the graphene. The graphene in the graphene modified polyolefin elastomer composite material is uniformly dispersed in the polyolefin elastomer; compared with a pure polyolefin elastomer material, the mechanical property of the graphene modified polyolefin elastomer composite material is remarkably improved; when the adding amount of the graphene is 2 percent, the tensile strength of the composite material is improved by 50 percent.

The invention is suitable for the technical field of material modification, and provides a polymer graft-coated modified calcium sulfate whisker, and a preparation method and application thereof. Thepreparation method comprises the following steps: in a water phase, carrying out surface modification on anhydrous calcium sulfate whisker with sodium oleate to obtain sodium oleate modified calcium sulfate whisker; mixing the sodium oleate modified calcium sulfate whisker with an acrylic monomer and an initiator, and carrying out polymer graft modification on the sodium oleate modified calcium sulfate whisker to obtain the polymer graft-coated modified calcium sulfate whisker. The anhydrous calcium sulfate whisker is modified by utilizing sodium oleate containing carbon-carbon double bonds, and acrylate monomers and introduced double bonds are subjected to copolymerization reaction under the action of an initiator, so that long-chain high-molecular polymers can be grafted and coated on the surface of the calcium sulfate whisker. The polymer grafted and coated modified calcium sulfate whisker can achieve a good stress transmission effect so as to improve the mechanical properties of ahigh polymer material.